package com.example.springpethospital.common.handler;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Collections;
import java.util.List;
import org.apache.commons.collections4.CollectionUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;

public abstract class ListTypeHandler<T> extends BaseTypeHandler<List<T>> {

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, List<T> parameter, JdbcType jdbcType) throws SQLException {
        String content = CollectionUtils.isEmpty(parameter) ? JSON.toJSONString(Collections.emptyList()) :
            JSON.toJSONString(parameter, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteNullListAsEmpty, SerializerFeature.WriteNullStringAsEmpty);
        ps.setString(i, content);
    }

    @Override
    public List<T> getNullableResult(ResultSet rs, String columnName) throws SQLException {
        return this.getListByJsonArrayString(rs.getString(columnName));
    }

    @Override
    public List<T> getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
        return this.getListByJsonArrayString(rs.getString(columnIndex));
    }

    @Override
    public List<T> getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
        return this.getListByJsonArrayString(cs.getString(columnIndex));
    }

    private List<T> getListByJsonArrayString(String content) {
        return StringUtils.isBlank(content) ? Collections.emptyList() : JSON.parseArray(content, this.specificType());
    }

    /**
     * 具体类型，由子类提供
     *
     * @return 具体类型
     */
    protected abstract Class<T> specificType();

}
